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I bought two Raspberry Pi's in October. One of them is currently doing duty as an IRC server inside of one of my Broadband-Hamnet mesh nodes (formerly HSMM-MESH), the other is for use as a backup, and for experimenting.

http://www.hsmm-mesh.org/

There's actually an amateur radio project to create a mesh network, as WiFi channels 1-6 actually fall into the ham bands. It's not very widespread in that you can just set up a node and get on, but it is pretty easy to deploy at events or in emergencies - just take the router out and plug it in. The site is hsmm-mesh.org.

with specialized antennas, routers, and the additional transmitter power allowed by a ham radio license it is possible to quickly create a mesh network in the event of an emergency. http://hsmm-mesh.org/

there are also the data services provided by d-star, and much of our country is already covered by dstar repeaters, many with backup power etc. i have heard of some joint operation with first responders using these.

failing data, there is always the worldwide and local voice communication network provided by hams in times of emergency.

I thought hams were supposed to be well behind the bleeding edge these days, yet.. HSMM-MESH.org has the OpenWRT and OLSRd based firmware to build a self-healing self-configurable wireless mesh using off the shelf hardware..

There is certainly the "talk to people" aspect in many facets of amateur radio, but there is plenty of other interesting stuff going on too.
Like you, I am not very interested in the social side of things, but still I find a lot to do with my license, for instance http://hsmm-mesh.org/

One thing I had to learn after being in the hobby for a while is that you really have to specialize if you want to get technical. The social crew mostly floats from whatever technology is popular to the next but never really understand it beyond "how do I talk". The technical guys are less likely to appear in public, but they enjoy actually making it work and many rarely even get on the air, thats not where their interest lies and thats ok.

I can't think of anything you could do "without consent" but check these out:

http://netsukuku.freaknet.org/
http://hsmm-mesh.org/

Interesting, I'll give it a look.

The closest IRL project I knew about until now was HSMM-MESH:

http://hsmm-mesh.org/

*Runs in for the slam dunk*

http://www.hsmm-mesh.org/

BOOM shaka laka laka laka

Buying on eBay, if done occasionally would be allowed. (The so called "pizza rule.")
Selling would be allowed only if ham gear and occasionally, and not if it's your job.
It's unlikely to be done on HF (but nobody really knows what the Pactor-3 users are doing that they ought to be doing with commercial SailMail).
But over microwave links it could and does happen often, since several of the 802.11 2.4 GHz channels overlap with ham bands.

There's an interesting project, probably most closely related to this topic, at http://hsmm-mesh.org/ using Linksys routers and OSS mesh software.

I want to know the bloody details of the wireless mesh.

Here's a place to start: HSMM-MESH

guerrilla.net was active some years ago, then after a sellout to l0pht, it went dark. It really is time to resurrect the idea of an "underground Internet," consisting of radio links and mesh networks. If you don't believe it's possible that the gov't will ever invoke the "kill switch," think again: Right after 9/11, the gov't did something that was considered both improbable and impossible: It effectively banned all air traffic across the nation. And it did so without asking the public for its input. Does anyone think the gov't will ask the public for its input when (and if) it decides to kill the Internet to ensure "national security"?